There are several ways to check your Sephora gift card balance:

Online:

Visit Sephora's website: Go to https://www.sephora.com/
Click "Check Your Balance": You'll find this link near the top of the page.
Enter card details: Input the 16-digit gift card number and PIN located on the back of the card.

 
Check balance: The website will display the remaining balance.
In-Store:

Visit a Sephora store: Find a location near you.
Ask a cashier: Approach any cashier and request to check your gift card balance.
Provide card details: The cashier will need the 16-digit card number and PIN.  
Check balance: The cashier will use the store system to check the balance and inform you.
By Phone:

Call Sephora's customer service: Dial 1-888-860-7897.  
Follow instructions: The automated system will guide you through the process.
Provide card details: Input the 16-digit card number and PIN when prompted.  
Check balance: The system will announce the remaining balance.
Remember: You'll need the 16-digit gift card number and PIN located on the back of the card for all methods.  sephora gift card balance,check sephora gift card balance, sephora gift card balance check